Transformation dislocations and transformation induced crystal defects in CoFe alloys

Abstract
In CoFe alloys the transformation dislocations and the transformation induced defects were analysed by both conventional transmission electron rnicroscopy and high-resolution transmission electron microscopy methods. The thermally induced transformation fcc → dhcp occurs by the glide of transformation dislocations that all have the same Shockley partial Burgers vector and therefore cause large shear strains. Plastic deformation near the front of the glissile interface activates glide dislocations in the fcc parent phase. Their subsequent reactions with the transformation dislocations lead to a high density of grown-in dislocations and stacking faults in the dhcp lattice.